I know it may be sound "crazy", just go to Windows Help (the original MS), type in the index map, and "voila":
Quote from Windows Help:
To assign (map) a drive letter to a network computer or folder
1. Click Start, point to Programs, and then click Windows Explorer.
2. On the Tools menu, click Map Network Drive.
3. In Path, type the path to the you want. For example:
\\computername\foldername
If a password is required, Windows prompts you.
Notes
- You can also right-click My Computer or Network Neighborhood, and then click Map Network Drive.
- To map to a computer or folder you've used recently, click the arrow to the right of Path, and then click the resource you want.